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Research Spotlight: Analysis of Rectangular CFT Columns Subjected to Elevated Temperature

2017 Annual Stability Conference Preview

Session SS2b- Technical Presentations: Stability at Elevated Temperatures Tuesday, March 21, 2017 3:15 pm

Analysis of Rectangular CFT Columns Subjected to Elevated Temperature

This paper used a fiber-based analytical approach, which was developed and benchmarked previously by the authors, to investigate the effects of various parameters on the behavior and strength of rectangular CFT columns subjected to elevated temperature. The parameters considered were the steel tube yield stress (Fy), concrete compressive strength (f’c), tube width-to-thickness ratio (B/t), column slenderness ratio (KL/r), and magnitude of temperature. Results from the parametric studies indicated that the axial compressive strength of rectangular CFT columns decreased significantly with increasing temperature. The effect of temperature was more significant for columns with intermediate length and less significant for short and slender columns. Increasing the concrete compressive strength (f’c) effectively improved the axial compressive strength of rectangular CFT columns subjected to elevated temperature. While changing the steel tube yield stress (Fy) or the steel tube width-to-thickness ratio (B/t) had smaller influences.

Zhichao Lai and Amit H. Varma, Purdue University, West Lafayette, IN; Anil Agarwal, Indian Institute of Technology, Hyderabad, Telangana, India

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